Cartridge-fuse.



0. H. JUNG.

CARTRIDGE FUSE.

APPLICATION r1120 MAYIQ. I9I7.

1,275,442. Patented Aug. 13, 1918.

1 I W m m I I tachin UNITED STATES PATENT OFFICE.

OSCAR H. JUNG, MILWAUKEE, WISCONSIN, ASSIGNOR TO ARROW FUSE & MFG. 10.,

) OF MILWAUKEE, WISCONSIN.

CARTRIDGE-FUSE.

Patented Aug. 13, 1918.

Application filed May 19, 1917. Serial No. 169,638.

To all whom it may concern:

Be it known that I, OSCAR H. J one, a citizen of the United States, andresident of Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented certain new and useful Improvements inCartridge- Fuses; and I do hereby declare that the following is a full,clear, and exact description thereof.

My invention relates to certain new and useful improvements in fuses,and refers to a fuse embodying somewhat the same principles as thoseembodied in my application filed March 8, 1917, Serial No. 153325.

The primary object of this invention is to produce an inexpensive andsimply constructed refillable fuse in which the fusible strip isinclosed, and which will meet the strict requirements exacted of allapproved fuses by the Underwriters Laboratories.

Another object is to provide a fuse of the knife blade type in which thefuse proper is contained within a casing of non-conducting material,which casing carries the attaching blades.

A further object is the provision of such a fuse which will have novelmeans for atthe ends of the fusestrip with the attaching blades, andwhich will have novel means for securing the knife blades to the casing.

A still further object of my invention is the production of a device ofthe character and for the purpose described which will be simple inconstruction, eflicient and practical, and inexpensive to manufacture,all things being considered.

- With the above and other objects in view which will appear as thedescription proceeds, my invention resides in the novel construction,combination and arrangement of parts substantially as hereinafterdescribed and particularly defined by the appended claims, it beingunderstood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

In the accompanying drawings I have illustrated one complete example ofthe physical embodiment of my invention constructed according to thebest mode I have so far devised for the practical application of theprinciples of my invention, in wihich:

Figure 1 is a sectional view taken longi tudinally through a knife fuseembodying my invention.

Fig. 2 is a sectional view taken on the plane indicated by line 2-2 ofFig. 1.

Fig. 3 is a transverse sectional view taken on the plane indicated byline 3-3 of Fig. 1, and

Fig. 4: is a perspective View of the yoke clamp employed to rigidlysecure the knife blades to the outer casing.

Referring now more particularly to the several figures of the drawingwherein similar reference characters designate like parts, the numeral 1denotes a cylindrical tube of fiber or other non-conducting material andfor closing the ends thereof, a pair of like metallic caps 2 areemployed provided each with a centrally disposed elongated slot 3 an apair of smaller slots 4 disposed one on each side of said central slot.

Engaging the slots 3 are a pair of attaching blades 5 having their outerends plain for engagement with the usual spring clip of a switch board(not shown) and their inner ends disposed inside of the caps 2 andprovided near their inner edges with recesses 6 to allow adjustmenttherein of threaded screws 7 employed for securing the caps 2 upon thecasing 1.

The screws 7 also assist in retaining the knife blades 5 in the caps 2and engage the arms 8 of the yoke clamps 9, said yoke clamps beingprovided with portions 10 adapted to lay flush against the inner surfaceof the caps 2 having laterally turned arms 8 and then inwardly turnedforked or bifurcated portions 11. said bifurcated por tion engaging theblades 5 as clearly shown in Fig. 1. The yoke clamps are thus in theform of substantially U-shaped plates having slotted base portions andinturned bifurcated end portions.

The yoke clamp 9 is adapted to be secured to the caps 2 and for thispurpose is providcd with a pair of laterally extending ears or lugs 12adapted to be bent outwardly and then inwardly and engaging the slotted.

Y openings l as more clearly shown in Fig. 2.

Thus it will be seen that the knife blades 5 are rigidly, but detachablysecured to the caps 2, forming a verv desirable construction.

T he fuse cartridge proper is disposed in the casing 2 and consistsessentially in the tubular casing 13 of noirconducting n1a terial-havingclosing the ends thereof a pair of metallic caps 14 provided withventilating openings 15 and elongated slots 16 through which pass thefusible strip 17 having the I usual reduced central. portion 18 andbeing surrounded by a finely divided arc-choking material 10. p The endsof the fuse strip 1'? extend outwardly of the caps 14 and are providedwith apertures 19 adapted to engage the'bolt 20 which also engages acorresponding aperture 21 in the inner end of the blades 5. In this waythe fuse strip is connected with the blades .5 and to prevent shiftingof the fuse strip Within its container cotter pins 22 are employeddisposed one at each cap 14.

Thus it will be seen from the foregoing description taken in connecti'onwith the accompanying drawing that l have provided a fuse in which thefusible link will be readily interchangeable and one which accomplishesthe desired objects Without the complicated arrangement and constructionof the existing fuses of this type.

What is claimed is:

1. A device of the class described comprising an open end casing, aslotted cap for closing one end of the casing, an attaching bladeextending through the slot or" the cap, a lil shaped plate having a slotin its base receiving said blade, the arms .of the plate being securedto the casino, means carried by the arms for engaging the inner end ofsaid blade, and a fusible link secured to said blade,

2. A device of the class described comprising an open end casing, aslotted cap for closing one end of the casing, an attaching bladeextending through the slot of the cap, a 'ol-shapedplate having a slotin its base receiving said blade, the arms of the plate bein secured tothe casin the inner end b I or one of said arms being inturned and b1-furcated, the inner end of saidblade being disposed between thefurcations, and a fusible link connected to the inner end of said blade.

3. A device of the classdescribed comprising an open end casing, aslotted cap for closing one end of the casing, an attaching bladeextending through the slot of the cap, a U-shapedplate having a slot inits base receiving said blade, the arms of the plate attaching bladedisposed through said central slot, a U-shaped plate having a slot inits base receiving said blade, means on the arms or the plate forengaging the inner end of the blade, lugs extending from the plate anddisposed in said relatively smaller slots in the cap, and a fusible linkconnected with the inner end of said blade.

5. A device of the class described comprising an open end casing, a capfor-closing one end of the casing, said cap having a central slot andrelatively smaller slots disposed one on each side of said central slotan attaching blade disposed through said central slot, a plate having aslot receiving said blade, oppositely extending lugs on the plate, saidlugs beingdisposed through said relatively smaller slots and bentlaterally, means carried by the plate for enga ing the inner end of theblade, and a fusi le link connected with the innerend of said blade.

6. Adevice of the class described comprising an open end casing, aslotted cap for closing one end of the casing, an attaching bladeextending through the slot in the cap, the

opposite edges of said blade being notched,

a U-shaped plate having a slot in itsbase receiving said blade, screwsextending through the cap and the arms of said U- shaped plate andengaged with said notches blade to limit every movement thereof, and afusible link secured to the inner end of the blade.

7. Anelcctrical fuse'unit comprising, in 1 combination, a non-conductingopen ended casing, metallic caps covering the ends thereof and providedeach with a central clon-' gated slot and relatively smaller slotsdisposed one on each side of said central slot,

an attaching blade carried by each cap and projecting throu h thecentral slots into the casing, a yoke 0 amp having lugs engaging thesmaller slots and having their ends inturned to clamp the inner ends ofsaid blades and a fuse cartridge disposed within said casing and havingits fusestrip in 0011- nection with the inner ends of the attachingblades. I 1

8. A device of the class described com.- prising an open end casing,aslotted cap for closing one end of the caslng', an attaching bladeextending through the slot inflthe cap, the opposite edges of said bladebeing notched,-a U-shaped plate having a slot in its base receiving saidblade, the inner ends of the arms of said plate being inturned andbifurcated to receive the inner end of said 5 blade, screws extendingthrough said caps and the arms of said U-shaped plate and engaged withsaid notches in the blade to limit.

outward movement of the latter, and a fusiblade.

ble link secured to the inner end of the 10 In testimony that I claimthe foregoing I have hereunto set my hand at Milwaukee, in the county ofMilwaukee and State of Wisconsin.

@SOAR H, JUNG.

